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Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
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Published on: February 12, 2014

Scattering calculation and image reconstruction using elevation-focused beams.

David P Duncan1, Jeffrey P Astheimer, Robert C Waag

  • 1Department of Electrical and Computer Engineering, University of Rochester, Rochester, New York 14627, USA.

The Journal of the Acoustical Society of America
|May 12, 2009
PubMed
Summary
This summary is machine-generated.

This study shows that 2D imaging algorithms can reconstruct 3D objects when elevation is constant. However, 3D scattering effects require compensation for accurate attenuation slope imaging.

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Area of Science:

  • Acoustic imaging
  • Wave scattering
  • Image reconstruction

Background:

  • Quantitative imaging of 3D objects using 2D algorithms presents challenges.
  • Elevation-focused illumination and reception are employed to address these challenges.

Purpose of the Study:

  • To analytically calculate scattered pressure from objects with elevation-focused beams.
  • To reconstruct cross-sections using a 2D algorithm and evaluate imaging constraints.

Main Methods:

  • Analytical calculation of scattered pressure from cylindrical and spherical objects.
  • Utilizing elevation focusing represented by angular spectra of plane waves.
  • Employing a Fourier interpolation method for efficient computation of angular spectra.
  • Reconstruction using an eigenfunction method with multiple frequencies, phase compensation, and iteration.

Main Results:

  • Scattered pressure simplifies to a 2D expression, validating 2D algorithms for objects with constant elevation within the beam.
  • Energy loss due to scattering outside the reception aperture can overestimate attenuation slope at object boundaries.
  • Reconstructed sound speed images are minimally affected by the loss of scattered energy.

Conclusions:

  • Two-dimensional reconstruction algorithms are applicable for 3D objects when the relevant region is elevationally constant.
  • Compensation is necessary in 2D reconstructions to account for uncaptured 3D scattering effects.
  • Sound speed imaging is more robust to scattering losses than attenuation slope imaging.